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7939a1e.tmp

tanzuki

This is the installer/setup program for a Yontoo adware component, a web browser plugin that injects unwanted ads in the browser. The file 7939a1e.tmp by tanzuki has been detected as adware by 1 anti-malware scanner with very strong indications that the file is a potential threat. The program is a setup application that uses the NSIS (Nullsoft Scriptable Install System) installer. It is also typically executed from the user's temporary directory. The file has been seen being downloaded from dl-2.kbm2.com.
Publisher:
tanzuki  (signed and verified)

MD5:
02c64a6746fe528be30bc8592525cedb

SHA-1:
865e6b9f15b343214cf4849c463e5e779ad10fd3

SHA-256:
c34401bf5cfb1787ec4e9f9c087ca27d0abe2ab6d92c1d7f75fd8c9bc174fc90

Scanner detections:
1 / 68

Status:
Adware

Explanation:
Belongs to the Sambreel/Yontoo progam that inserts various forms of advertising in the user's web browser, installed with minimal or no user consent.

Analysis date:
12/25/2024 1:32:42 AM UTC  (today)

Scan engine
Detection
Engine version

Reason Heuristics
PUP.tanzuki.K
14.10.20.12

File size:
198 KB (202,752 bytes)

Installer:
NSIS (Nullsoft Scriptable Install System)

Common path:
C:\users\{user}\appdata\local\temp\7939a1e.tmp

Digital Signature
Signed by:
tanzuki

Authority:
VeriSign, Inc.

Valid from:
8/20/2013 8:00:00 PM

Valid to:
8/20/2015 7:59:59 PM

Subject:
CN=tanzuki, OU=Digital ID Class 3 - Microsoft Software Validation v2, O=tanzuki, L=San Diego, S=California, C=US

Issuer:
CN=VeriSign Class 3 Code Signing 2010 CA, OU=Terms of use at https://www.verisign.com/rpa (c)10, OU=VeriSign Trust Network, O="VeriSign, Inc.", C=US

Serial number:
5094CECD4B5D21903C384E60AC45C6C4

File PE Metadata
Compilation timestamp:
12/5/2009 5:50:41 PM

OS version:
4.0

OS bitness:
Win32

Subsystem:
Windows GUI

Linker version:
6.0

CTPH (ssdeep):
3072:2Lk395hYXJsCf17VVXenKW8ZSnldhuADX9anH7l1m/GqMHJGULvs:2QqDfVVVXI+ilnXYnH7nm/G/HcP

Entry address:
0x30CB

Entry point:
81, EC, 80, 01, 00, 00, 53, 55, 56, 33, DB, 57, 89, 5C, 24, 18, C7, 44, 24, 10, 60, 91, 40, 00, 33, F6, C6, 44, 24, 14, 20, FF, 15, 30, 70, 40, 00, 68, 01, 80, 00, 00, FF, 15, B0, 70, 40, 00, 53, FF, 15, 7C, 72, 40, 00, 6A, 08, A3, 38, 3F, 42, 00, E8, F1, 2B, 00, 00, A3, 84, 3E, 42, 00, 53, 8D, 44, 24, 34, 68, 60, 01, 00, 00, 50, 53, 68, 30, F4, 41, 00, FF, 15, 58, 71, 40, 00, 68, 54, 91, 40, 00, 68, 80, 36, 42, 00, E8, A4, 28, 00, 00, FF, 15, AC, 70, 40, 00, BF, 00, 90, 42, 00, 50, 57, E8, 92, 28, 00, 00...
 
[+]

Entropy:
7.8952

Packer / compiler:
Nullsoft install system v2.x

Code size:
22.5 KB (23,040 bytes)

The file 7939a1e.tmp has been seen being distributed by the following URL.

http://dl-2.kbm2.com/.../tanzuki20130829.exe

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